[Bug 494476] Re: "Smbd", "kjournald2" and "rsync" blocked for more than 120 seconds while using ext4.

[Lars]

Hi,

I have success with setting the block-io-scheduler to something different than »deadline« for each block device in our raid arrays.
This is with kernel: 2.6.32-24-server

I tried »noop« and it worked fine for me. This is not reproduced yet,
because a backup lasts more than 12 hours each. Today I'll test cfq and
report.

To read the current or set the scheduler for each block device through /sys/block/sd*/queue/scheduler.
On the other hand you can set it globally with the boot option: »elevator=cfq« (or »noop« or »anticipatory«)

Good luck
Lars

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"Smbd","kjournald2" and  "rsync"  blocked for more than 120 seconds while using ext4.
https://bugs.launchpad.net/bugs/494476
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